JPH0539981A - Rotary dryer - Google Patents

Abstract

PURPOSE:To dry strand-like articles to be dried while they are cut into adequate lengths by a method wherein a drum is provided with a rotary shaft and two or more partition plates arranged radially, so that the cross-section of the drum is divided into two or more sectors and two or more drying chambers are formed between the drum and the shaft. CONSTITUTION:A rotary shaft 20 is arranged at the center of a drum 10, and first-fifth partition plates 11-15 are radially furnished between the inner wall of the drum 10 and the rotary shaft 20 at nearly the same intervals to form first-fifth drying chambers 21-25 having almost the same cross-section area. When the cross-section of the drum 10 divided into the five drying chambers, each drying chamber has a cross-section shape of about equilateral triangle and the articles to be dried are agitated while they are rotated, resulting in an efficient drying of the articles by hot air. As flap plates 31-35 attached on the inner wall of the drum 10 are bent at their edges so as to lift the articles to be dried when the drum 10 is turned counterclockwise, the strand-like articles fall down toward the rotary shaft 20 and are cut into adequate lengths by the falling impact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drier, and more particularly to a rotary drier in which a relatively soft material to be dried is introduced from one side and hot air is sent.

[0002]

2. Description of the Related Art Conventionally, various rotary dryers have been known. The present inventor has also been involved in the research and development of such a rotary dryer, and has filed several patent applications (for example, Japanese Utility Model Publication No. 57-28066).

However, extruded products which are relatively soft and fragile, for example, surimi of meat and fish, bean jam, pet foods, etc., are extruded in a strand form or a string form by an extruder and dried to be dried. There was a problem that when it was dried due to its brittleness, it was already crushed into fine pieces and the original purpose of granulation could not be achieved. In particular, when a granular material such as whole-grain cottonseed or corn is mixed, it tends to be more brittle, and there is a problem that the strand is not cut (or cut into pieces) into an appropriate length and becomes too fine. An extruder that extrudes in a strand shape is widely known (for example, Japanese Examined Patent Publication 6).
2-61333, Japanese Patent Publication No. 61-11663, etc.).

[0004]

Accordingly, the present invention is intended to provide a rotary dryer capable of drying a strand-shaped material to be dried while cutting (or shredding) it to an appropriate length.

[0005]

In order to solve the above problems, the object can be achieved by dividing the inside of the cylinder into a plurality of drying chambers by a plurality of partition plates.
The number of partition plates, that is, the number of drying chambers is preferably 4 to 6,
Particularly, 5 is more preferable. If the number is three or less, the cross-sectional shape of the drying chamber becomes long and a large impact is applied when the material to be dried falls, which is not preferable. Further, if the number of the dried articles is 7 or more, the cross-sectional shape of the drying chamber becomes elongated, so that not only is a large impact easily received when the articles to be dried fall in the radial direction, that is, the radial direction, but also the articles to be dried are concentrated on one side and hot air is blown. The problem arises that it becomes difficult to pass through efficiently.

A lifter is preferably provided in each of the drying chambers so that the material to be dried is agitated and dried, and in order to reduce the impact when dropped. The most efficient position is the inner wall of the cylinder of each drying chamber, and it is more effective to attach a backing plate to each partition plate to further reduce the impact.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Several embodiments illustrated in the drawings will be described in detail below, but it goes without saying that the present invention is not limited to these embodiments.

FIG. 1 is a side sectional view of a cylinder 10 of a rotary dryer, showing a first embodiment of the present invention. A rotary shaft 20 is arranged at the center of rotation of the cylinder 10, and a first partition plate 11 and a second partition plate 1 are provided between the rotary shaft 20 and the cylinder 10.
The first to fifth drying chambers in which the second, third partition plate 13, fourth partition plate 14 and fifth partition plate 15 are mounted in a radial or radial pattern at substantially equal intervals and have substantially equal cross-sectional areas Two
1, 22, 23, 24, 25 are formed. In this way, when the cross section of the cylinder 10 is divided into five drying chambers, the cross-sectional shape of each drying becomes a substantially equilateral triangle, and the material to be dried is agitated while rotating, so that the drying by hot air becomes efficient.

The first to fifth drying chambers 21, 22, 2
First to fifth lifters 31, 32, 33, 34, 35 are attached to the inner walls of the cylinders 3, 24, 25, respectively. In FIG. 1, since the cylinder 10 rotates counterclockwise, the tips of these lifters 31, 32, 33, 34, 35 are slightly bent so as to lift the material to be dried. The material to be dried is lifted by the lifter and, when it reaches the upper position, drops from the lifter in the direction of the rotary shaft 20.
At this time, the strand-shaped material to be dried is cut by the impact and has an appropriate length, for example, about 30 millimeters (mm). The material to be dried can be transported in the axial direction by installing the cylinder 10 obliquely.

The partition plates 11, 12, 13, 1
As for the attachment of Nos. 4 and 15, the partition plate is sandwiched by U-shaped fittings fixed by welding means as shown in FIG. 1 and bolted (not shown). It is preferable that the mounting hole on the partition plate side is made slightly longer so that when the cylinder 10 or the like is stressed by thermal expansion, this can be eliminated. However,
At least one location, for example, the rotary shaft 20 of the first partition plate 11.
The side should be completely fixed by welding means. Since the lifters 31, 32, 33, 34 and 35 are not connected to other places, fixing by welding means is sufficient.

2 and 3 show the second embodiment of the rotary dryer according to the present invention.
FIG. 2 is a cross-sectional view of the main part of FIG.
FIG. 4 is a side sectional view of a cylindrical portion.

A rotating shaft 50 is arranged at the center of rotation of the cylinder 40, and a stopper 48 is formed at the inlet port 46 side of the cylinder 40 in a circumferential shape so that the substance to be dried is not spilled outward. ing. The material to be dried is charged into the charging port 46 through a charging pipe 52, and the heater 54 is also passed through the charging port 46.
The hot air is blown into the cylinder 40. The introduced strand-shaped material to be dried is sequentially transferred to the other end side of the cylinder 40 while being dried, and after drying, it moves to the outlet 62 while moving inside the outer cylinder 60, and the whole process is completed. The outer cylinder 60 is used to improve the thermal efficiency, and may be omitted in some cases.

In this embodiment, two lifters are provided on the inner wall of the cylinder of each drying chamber so that the material to be dried is sufficiently stirred. That is, the lifter 4 is installed in the first drying chamber.
1a, 41b, lifters 42a, 42 in the second drying chamber
b, lifters 43a and 43b are attached to the third drying chamber, lifters 44a and 44b are attached to the fourth drying chamber, and lifters 45a and 45b are attached to the fifth drying chamber. Further, in order to prevent the material to be dried from falling directly from the lifter in the direction of the rotating shaft 50, that is, in order to absorb the impact, the first to fifth partition plates 4 are provided.
1; 42; 43; 44; 45 respectively have receiving plates 41c,
41d; 42c, 42d; 43c, 43d; 44c, 4
4d; 45c and 45d are attached.

The mounting position is preferably approximately in the radial direction of each partition plate. The receiving plates 41c, 42c, 43c, 44c, 45c attached to the counterclockwise side of each partition plate are
It is obliquely attached so as to gradually approach the rotary shaft 50 in the transfer direction of the material to be dried, that is, in the flow direction. This is to feed the material to be dried in the flow direction or the transfer direction while receiving the material to be dried falling from the lifters or the vicinity thereof.

Similarly, the receiving plates 41d, 42d, 43d, 44d, 45d mounted on the clockwise side of each partition plate are also mounted obliquely so as to feed the material to be dried in the flow direction (that is, the feeding direction). In this case, the receiving plates 41d, 42d, 4
3d, 44d, and 45d have end portions bent in the direction of the receiving plates 41c, 42c, and 43c in order to receive an object to be dried when falling in the direction of the cylinder 40 from the rotating shaft 50 side.
Opposite to 44c and 45c, when viewed in the transfer direction, they are obliquely attached so as to gradually separate from the rotary shaft 50. That is, the receiving plates 41c, 42c, 43c, 44
c, 45c and receiving plates 41d, 42d, 43d, 44d, 4
5d and 5d are attached so as to cross each other.

The partition plate and the lifter are appropriately lengthwise, for example, 5 in the axial direction of the rotary shaft 50 so that the material to be dried is sufficiently agitated without gathering in a specific place and the hot air acts efficiently.
Block every 0 centimeter (cm),
Adjacent blocks are half pitch (that is, adjacent blocks in the rotation direction
When each partition plate, lifter, and receiving plate are attached so that they are offset by half the angle formed by one partition plate, the material to be dried is sufficiently agitated to dry well.

In FIG. 2, block B1 and block B3
Are in phase, that is, in the same angular position, and block B2 and block B4 are in phase. Therefore, in the blocks adjacent to each other in the axial direction of the rotary shaft, for example, B1 and B2, the partition plates are displaced by half a pitch (in the second embodiment, the angle is 36 degrees), and of course, each lifter and each receiving plate are displaced. The plates are also shifted by half a pitch.

For example, the block B1 is shown in cross section in FIG. 3, and the adjacent block B2 is directly visible as a solid line.

The first block B in FIG.
Although the partition plate is also provided in No. 1, if the partition plate is not attached and only the helical lifter as shown in FIG. 4 is used, it becomes easy to receive the strand-shaped dried material from the charging pipe 52 and the dried material is removed. There is an advantage that it is difficult to spill outward. Of course, the helical lifter as shown in FIG. 4 can be applied to the first embodiment shown in FIG.

Also, if the lifter in each of the embodiments is obliquely attached like the receiving plate, it is convenient because the material to be dried easily moves in the feeding direction. Since the object to be dried is carried by the lifter on this stand, the cylinder may be installed horizontally.

[0021]

As described above, the present invention has an advantage in that the inside of the cylinder is divided into a plurality of drying chambers by a plurality of partition plates, so that a large impact is not applied when the material to be dried falls.
Further, since a lifter is provided in each drying chamber, the material to be dried is agitated and dried, and the material to be dried in a strand form is cut into appropriate lengths. Furthermore, since the receiving plate can be attached to each partition plate, there is an advantage that not only can the drying be performed more effectively, but also the material to be dried can be cut into an appropriate length. Since the surface of the material to be dried is dried quickly, the pelletized material to be dried is also solidified on the surface, which makes it difficult to be finely pulverized.

[Brief description of drawings]

FIG. 1 is a side sectional view of a cylindrical portion of a first embodiment of a rotary dryer according to the present invention.

FIG. 2 is a cross-sectional view of essential parts of a second embodiment of the present invention.

FIG. 3 is a side sectional view of a cylindrical portion of the second embodiment.

FIG. 4 is a cross-sectional view of essential parts of a third embodiment of the present invention.

[Explanation of Codes] 10 Cylinder 11, 12, 13, 14, 15 Partition Plate 20 Rotating Shaft 21, 22, 23, 24, 25 Drying Chamber 31, 32, 33, 34, 35 Lifter 40 Cylinder 41, 42, 43, 44, 45 Partition plates 41a, 41b, 42a, 42b, 43a, 43b, 4
4a, 44b, 45a, 45b lifters 41c, 41d, 42c, 42d, 43c, 43d, 4
4c, 44d, 45c, 45d Support plate 46 Input port 48 Stopper 50 Rotating shaft 52 Input pipe 54 Heater 60 Outer cylinder 62 Discharge port B1, B2, B3, B4 block

Claims (6)

[Claims] 1. A method of drying with hot air while moving an object to be dried in a rotating cylinder, comprising: (a) a rotating shaft arranged in the cylinder; and (a) a rotating shaft and the cylinder. And a plurality of partition plates arranged in a radial shape so as to be divided into a plurality of drying chambers. 2. The rotary dryer according to claim 1, wherein the partition plate is divided in the axial direction of the rotary shaft, and the axially adjacent partition plates are displaced in the rotational direction. 3. The rotary dryer according to claim 1 or 2, wherein the number of the partition plates is five. 4. The rotary drying according to claim 1 or 2, wherein the number of the partition plates is 5, and the axially adjacent partition plates are offset by about 36 degrees in the rotational direction. Machine. 5. The rotary dryer according to any one of claims 1 to 4, wherein a receiving plate is attached to the partition plate. 6. The support plate according to claim 5, wherein the support plate is attached so as to be offset with respect to the axial direction of the rotary shaft.
Rotary dryer.